I have a very old Smith and Wesson No. 3 Model in 44 calibre that needs repair. I can chock the handgun but the cylinder does not lock into place. In otherwords the cylinder rotates freely. How can I get this fixed ? Who out there is a good gunsmith that can do this for me ? I live in Canada and a little hesitant to ship this gun as it is a very old and expensive engraved antique. Tim

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Good schematic sicko! Based on what the OP has written, part 880 is not stopping the cylinder.
That could be that spring 881 is not working, or part 880 is broke or part 908 is broke.

Part 881 keeps pressure on part 880 which is moved by part 908.
When cocked, the trigger lower portion is moved forward releasing part 880, and spring 881 pushes part 880 up, thus stopping the cylinder.

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I have worked on similar guns and danf_fl is right. Cylinder stop should be sticking out of the frame and should drop down when the gun is cocked, cylinder should rotate and the stop comes back up. You can probably watch this happen in the gap between the cylinder and the frame.